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Business Combinations - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Nov. 01, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Business Acquisition                        
Acquisition-related costs and expenses                     $ 1.0 $ 14.8
Revenues   $ 326.3 $ 332.8 $ 350.2 $ 337.1 $ 304.5 $ 314.9 $ 320.9 $ 309.4 $ 1,346.4 1,249.7 1,145.6
Loss from continuing operations before income taxes                   128.6 103.8 $ 40.8
Loss from equity method investment                   (2.9) 1.1  
Beck Trading                        
Business Acquisition                        
Percentage of voting interests acquired 49.00%                      
Cash paid at closing $ 23.6                      
Acquisition-related costs and expenses                     1.0  
Inventories $ 10.6 10.6               10.6    
Fair value adjustment to inventory                     0.3  
Distributions received                   6.0    
Revenues                     10.5  
Loss from continuing operations before income taxes                     1.1  
Loss from equity method investment                     1.1  
Beck Trading | Real Alloy | Accounts Receivable                        
Business Acquisition                        
Trade receivables   3.1       6.8       3.1 6.8  
Beck Trading | Real Alloy | Trade Payables                        
Business Acquisition                        
Trade payables   $ 0.8       $ 0.5       $ 0.8 $ 0.5